CN216525480U

CN216525480U - Defect detection device

Info

Publication number: CN216525480U
Application number: CN202122540569.5U
Authority: CN
Inventors: 陈灵铭
Original assignee: Guangdong OPT Machine Vision Co Ltd
Current assignee: Guangdong OPT Machine Vision Co Ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-05-13
Anticipated expiration: 2031-10-21

Abstract

The utility model discloses a defect detection device, comprising: the detection light source module comprises one or more light source components, and the light source components are used for irradiating from the front surface and/or the back surface of the detected workpiece; the imaging module is used for shooting from the front and/or the back of the detected workpiece to form a first detection image; and the laser camera modules surround the detected workpiece and are used for emitting detection laser to the side surface of the detected workpiece and shooting to form a second detection image. The utility model can realize the surface defect detection of the workpiece to be detected through the detection light source module and the imaging module, and simultaneously realize the appearance detection of the component to be detected by combining the laser camera module, thereby effectively saving the detection process, improving the detection efficiency and further meeting the production requirements of high efficiency and low cost input.

Description

Defect detection device

Technical Field

The utility model relates to the technical field of optical detection, in particular to a defect detection device.

Background

With the rapid development of industrial automation and intelligence, electronic products are now in a wide variety, and electronic components, such as resistors, inductors, capacitors, diodes, triodes, various microswitches, potentiometers, and integrated circuit chips, form the basis of these electronic products. The quality of these devices is critical to the yield, stability and satisfaction of the electronic product. Therefore, defect detection is required for these electronic components during the production process.

Because electronic components are various in types and shapes, in the conventional machine vision detection scheme, different detection items such as the external dimension precision, the surface appearance defects, the surface character bar code printing, the length of PIN needles, the appearance defects and the like of the electronic components need to be detected one by different processes or different stations, so that the detection equipment has the defects of multiple processes, low detection efficiency and high input cost, and the production requirements of high efficiency and low cost input are difficult to meet.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a defect detection device, which solves the problems that in the existing machine vision detection scheme, aiming at different detection items such as the external dimension precision of an electronic element, the surface appearance defect, the bar code printing of surface characters, the length of PIN needles, the appearance defect and the like, different processes or different stations are respectively required to be used for one-by-one detection, so that the detection equipment has multiple processes, low detection efficiency and high input cost, and the production detection requirements of high efficiency and low cost input are difficult to meet.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a defect detection apparatus, comprising:

the detection light source module comprises one or more light source components, and the light source components are used for irradiating from the front surface and/or the back surface of the workpiece to be detected;

the imaging module is used for shooting from the front and/or the back of the workpiece to be detected to form a first detection image;

and the laser camera modules are arranged around the detected workpiece in a surrounding manner and used for emitting detection laser to the side surface of the detected workpiece and shooting to form a second detection image.

Optionally, the laser camera module includes:

the mounting bracket is used for fixing the laser camera module at a position to be mounted;

the laser camera movably install in on the installing support, the laser camera can be driven for the installing support goes up and down and/or rotates.

Optionally, the detection light source module includes a light source housing, the light source housing is provided with a light transmission channel aligned with the imaging module, and the imaging module shoots the front surface of the workpiece to be detected through the light transmission channel;

a first light source assembly is arranged in the light source shell and comprises a first lamp panel used for emitting first detection light;

a spectroscope and a first diffusion plate are arranged along the light path of the first detection light, and the spectroscope is positioned on the light path of the first detection light and the light-transmitting channel; and after being reflected by the spectroscope, part of the first detection light is vertically irradiated on the front surface of the detected workpiece.

Optionally, the light source housing comprises a first housing, the first light source assembly being located within the first housing;

the first shell is provided with a shooting window, the shooting window is communicated with the light transmitting channel, and an additional lens is arranged in the shooting window.

Optionally, be equipped with heat radiation structure on the first shell, heat radiation structure is close to in first lamp plate setting.

Optionally, a second light source assembly is further disposed in the light source housing;

the second light source assembly comprises a second lamp panel used for emitting second detection light, the second lamp panel is annular, and the second lamp panel is arranged around the periphery of the light transmission channel;

and a second diffusion plate is arranged along the light path of the second detection light and is inclined to the first detection light, the second diffusion plate is a diffusion plate, and the second detection light passes through the second diffusion plate to form shadowless light which is obliquely irradiated on the front surface of the detected workpiece.

Optionally, the light source housing further includes a second housing, the second housing is disposed on the first housing and is located at a side of the first housing close to the workpiece to be measured, and the mounting bracket is fixed to the second housing;

and the position, which is overlapped with the light transmission channel, on the second shell is a light transmission structure.

Optionally, the detection light source further comprises a third light source assembly;

the third light source assembly comprises a third shell, a third lamp panel used for emitting third detection light is arranged in the third shell, a third diffusion plate is arranged on a light path of the third detection light, and the third detection light perpendicularly irradiates the reverse side of the detected workpiece after passing through the third diffusion plate.

Optionally, the first lamp panel, the second lamp panel and the third lamp panel respectively comprise a plurality of lamp beads, and the lamp beads are LED lamp beads mixed by RGB three-color light-emitting chips.

Optionally, a longitudinal parallel film and a transverse parallel film are disposed on the third diffusion plate.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a defect detection device which can realize surface defect detection on a workpiece to be detected through a detection light source module and an imaging module, and simultaneously realize appearance detection on a component to be detected by combining a laser camera module, thereby effectively saving detection procedures, improving detection efficiency and further meeting the production requirements of high efficiency and low cost input.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a defect detection apparatus according to the present invention;

FIG. 2 is a cross-sectional view of a defect detection apparatus according to the present invention;

FIG. 3 is a schematic view of the shape of a workpiece with pins;

FIG. 4 is a schematic view of another profile of a workpiece under test with pins;

FIG. 5 is a schematic view of another shape of a workpiece with pins.

In the above figures: 10. a first light source assembly; 11. a first housing; 12. a shooting window; 121. a lens is added; 13. a first lamp panel; 131. a first diffusion plate; 132. a beam splitter; 14. a heat sink; 20. a second light source assembly; 21. a second housing; 22. a second lamp panel; 221. a second diffusion plate; 30. a third light source assembly; 31. a third housing; 32. a third lamp panel; 321. a third diffusion plate; 40. a laser camera module; 41. mounting a bracket; 42. a laser camera; 43. a connecting member; 50. an equipment machine table; 60. a conveyor belt; 61. a workpiece to be tested; 611. a stitch; 70. an imaging module.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.

At present, electronic components are various in types and shapes, and in the beginning of the existing machine vision technology, different detection items such as the external dimension precision, the surface appearance defects, the surface character bar code printing, the length of a PIN needle, the appearance defects and the like of the electronic components need to be detected one by one in different processes or different stations respectively, so that the detection equipment has the defects of multiple processes, low detection efficiency and high input cost, and the production requirements of high efficiency and low cost input are difficult to meet.

The present invention is directed to provide a defect detection apparatus to solve the above problems in the prior art, and the following describes the technical solution of the present invention with reference to the accompanying drawings and by way of specific embodiments.

Referring to fig. 1 and fig. 2, an embodiment of the utility model provides a defect detecting apparatus, including:

the detection light source module comprises one or more light source components, and the light source components are used for irradiating from the front surface and/or the back surface of the workpiece 61 to be detected;

the imaging module 70 is used for shooting from the front and/or the back of the workpiece 61 to be detected to form a first detection image;

and the laser camera modules 40 are arranged around the workpiece 61 to be detected in a surrounding manner, and are used for emitting detection laser to the side surface of the workpiece 61 to be detected and shooting to form a second detection image.

Wherein, each light source subassembly in the detection light source module can shine in the front or the reverse side of the work piece 61 that is surveyed with perpendicular or the angle of slope respectively, recycles imaging module 70 and images to the realization is surveyed the surface defect of work piece 61.

On this basis, the laser camera module 40 is used for emitting detection laser to the side surface of the workpiece 61 to be detected, and the camera is used for shooting, so that the three-dimensional appearance detection of the workpiece 61 to be detected is realized.

The modules are described in detail below.

The light source module comprises a light source shell, one or more light source components are arranged in the light source shell, the light source shell is provided with a light transmission channel aligned to the imaging module 70, the imaging module 70 can transmit the light transmission channel, and the front of the workpiece 61 to be measured is shot.

Specifically, the light source housing includes first housing 11, and first housing 11 offers and aims at imaging module 70's shooting window 12, and shooting window 12 communicates the printing opacity passageway, is equipped with in the shooting window 12 and increases lens 121, is favorable to guaranteeing imaging module 70's formation of image definition.

Specifically, the antireflection lens 121 is an antireflection dustproof tempered lens, the surface of which is plated with an antireflection film with a transmittance of more than 95%, so that light loss can be reduced to the maximum extent, and meanwhile, the lens of the high-strength tempering treatment process can effectively prevent sharp objects from being scratched, and fine particles and dust from entering the first housing 11.

Be equipped with in the first shell 11 and be used for carrying out the first light source subassembly 10 of defect detection to the reflection of light position of the workpiece 61 under test, first light source subassembly 10 is including being used for sending first lamp plate 13 of first detection light, still includes spectroscope 132 and first diffuser plate 131 that set up along the light path of first detection light, and spectroscope 132 is located the light path and the printing opacity passageway of first detection light.

Specifically, the beam splitter 132 is disposed obliquely to the first sealing plate, and a semi-transparent and semi-reflective film is plated on the beam splitter 132, and a portion of the first detection light is reflected by the beam splitter 132 and then vertically irradiated on the front surface of the workpiece 61 to illuminate the defects such as pits and damages on the reflective surface of the workpiece 61.

Meanwhile, the first diffusion plate 131 can effectively eliminate the LED particles of the first detection light to avoid affecting image recognition, and simultaneously, the first detection light can uniformly irradiate the spectroscope 132.

Based on this, the imaging module 70 shoots the front side of the workpiece 61 after passing through the spectroscope 132; the first detection light irradiated on the workpiece 61 is reflected and then passes through the transflective film of the beam splitter 132 to be injected into the imaging module 70.

Further, the first housing 11 is provided with a heat dissipation structure, in this embodiment, the heat dissipation structure is a heat dissipation fin 14, and the heat dissipation fin 14 is disposed close to the first lamp panel 13 and is used for conducting heat generated by the first lamp panel 13 during operation; it is understood that a fan, air or water cooling heat dissipation method may be used instead of the heat sink 14 to meet different heat dissipation requirements.

It will be appreciated that the first light source assembly 10 is a high angle illumination, and is primarily used to illuminate a reflective surface on the workpiece 61 to be tested, so as to enable detection of defective features on the reflective surface.

Considering that the surfaces of electronic components, except for PIN PINs, gold fingers and some reflective outer coating materials, often have more non-reflective surfaces, and for scratch defects, printed characters, marks, bar codes, dirt, image-text recognition and the like of the non-reflective surfaces, it is difficult to realize more accurate defect detection only by the first light source assembly 10. Therefore, the present embodiment further provides a low-angle, large-width and highly uniform illumination environment to further highlight the illumination brightness difference, thereby realizing the defect detection of the non-reflective surface.

In this embodiment, the light source housing further includes a second housing 21, the second housing 21 is disposed on the first housing 11 and is located on a side of the first housing 11 close to the workpiece 61 to be measured; simultaneously, the position with the coincidence of printing opacity passageway on this second shell 21 is light-permeable structure for imaging module 70 can see through this light-permeable structure in order to shoot by survey work piece 61, and first lamp plate 13 can see through this light-permeable structure in order to shine by survey work piece 61. It can be understood that the light permeable structure may be a hollow structure, or a structure formed by disposing the lens 121 in a hollow hole.

A second light source assembly 20 is arranged in the second housing 21; second light source subassembly 20 is the annular including second lamp plate 22 that is used for launching the second to detect light, second lamp plate 22, and second lamp plate 22 encloses the periphery of locating the printing opacity passageway.

The second diffusion plate 221 is disposed along the optical path of the second detection light, and the second diffusion plate 221 is inclined to the first detection light, so that the second detection light passes through the second diffusion plate 221 and then is obliquely irradiated onto the front surface of the workpiece 61.

The second diffuser 221 is a diffuser having a sandblasted high haze coating thereon. This second light source subassembly 20 adopts the design of diffuse reflection light path, makes the second detection light not direct projection work piece surface, but behind the diffuser plate of second diffuser plate 221, forms the slope and evenly shines in the positive shadowless light of the work piece 61 that is surveyed, has realized the low angle four sides shadowless effect of shining to can realize the defect detection on non-reflection of light surface.

In the present embodiment, the detection light source further includes a third light source assembly 30; the third light source assembly 30 includes a third housing 31, a third lamp panel 32 for emitting third detection light is disposed in the third housing 31, a third diffusion plate 321 is disposed along a light path of the third detection light, and the third detection light perpendicularly irradiates the reverse side of the workpiece 61 to be detected after passing through the third diffusion plate 321. Specifically, the third housing 31 is mounted on the equipment platform 50 and located below the workpiece 61 to be tested.

In addition, the third diffusion plate 321 is provided with a longitudinal parallel film and a transverse parallel film, the longitudinal parallel film is provided with longitudinal lines, and the transverse parallel film is provided with transverse lines, so that the third diffusion plate 321 forms a grating plate. Compared with an ordinary backlight source, after the third detection light passes through the longitudinal lines and the transverse lines in the third diffusion plate 321, the parallel directivity is improved from the longitudinal direction and the transverse direction, so that the peripheral light on the light emitting surface of the third light source assembly 30 can be prevented from diffusing along multiple directions, the light and shade boundary of the outer contour imaging edge of the detected workpiece 61 is further enhanced, and the outer contour identification of the detected workpiece 61 is clearer.

In this embodiment, first lamp plate 13, second lamp plate 22 and third lamp plate 32 include a plurality of lamp pearls respectively, the lamp pearl is the LED lamp pearl that the luminous chip of RGB three-colour mixes, can correspond according to the colour or the material on detection object surface and select monochromatic lighting or the color matching of polychrome lighting. Meanwhile, the lamp bead supports free switching between a normally bright stroboscopic mode and a high-bright stroboscopic mode so as to be suitable for detection of a high-speed assembly line.

In consideration of the PIN length, the bending angle, the surface defects of the metal PINs 611, and the like of various electronic components, in the present embodiment, a plurality of laser camera modules 40 are disposed around the workpiece 61 to be tested, so as to ensure the overall detection of the defects.

The laser camera module 40 includes:

the mounting bracket 41, the mounting bracket 41 is used for fixing the laser camera module 40 at the position to be mounted; alternatively, the mounting bracket 41 is fixed to the second housing 21.

The laser camera 42 is movably mounted on the mounting bracket 41 and can be driven to move up and down and/or rotate relative to the mounting bracket 41. Specifically, the laser camera 42 is integrated with an in-line laser emitter and a micro camera.

It is understood that the laser camera 42 can be mounted on the mounting bracket 41 through a connecting member 43, and the connecting member 43 can rotate relative to the mounting bracket 41 and can perform lifting motion along the height direction of the workpiece 61 to be detected, so that the laser camera can be adapted to different workpieces during detection.

For example, the rotation of the connecting member 43 relative to the mounting bracket 41 may be realized by a rotating shaft, and the connecting member 43 can perform a lifting motion along the height direction of the workpiece 61 to be measured, and may be automatically realized by a combination of a guide rail and an air cylinder, or may be manually realized by a guide rail and a positioning member.

In summary, the application examples of the embodiments of the present invention are as follows:

the workpiece 61 to be measured is sent to the position of the shooting window 12 through the transparent conveyor belt 60, and the third light source assembly 30 at the bottom is firstly lightened, so that the imaging module 70 can shoot clear outline images of the workpiece 61 to be measured, and precise outline measurement and judgment are realized; subsequently, the first and second

light source assemblies

10 and 20 illuminate the front surface of the workpiece 61 to be tested to enable defect identification of surface features.

Based on this, the background image recognition processing software determines the type of the workpiece 61 to be tested (different types of workpieces, the shapes of the pins 611 are different in length), based on the determination result, the lifting adjustment and the rotation adjustment of the laser camera 42 in the laser camera module 40 are realized, and the laser camera module 40 is lightened, so that the recognition and detection of the length and the bending angle of the pins 611 on the workpiece 61 to be tested are realized.

Through the nimble collocation of first light source subassembly 10, second light source subassembly 20, third light source subassembly 30 and laser camera module 40, can realize carrying out comprehensive defect detection's effect to different kind of work pieces at a station.

An example of defect detection of the pin 611 profile of the workpiece 61 under test is as follows:

as shown in fig. 3: when looking down, the stitches 611 on both sides are not flush, which means that the bending angles of the stitches 611 are not consistent. At this time, the third light source assembly 30 may be turned on, or the first light source assembly 10 may be turned on, and the imaging module 70 is then used to capture images, so as to realize further detection and determination.

As shown in fig. 4: the increasing situation of the height of the pin 611 is detected in a side view, and due to the fact that the pin 611 has a gradually decreasing and increasing variation trend in design, the emission angle of the detected laser in the laser camera module 40 can be adjusted to adapt to the gradually decreasing and increasing variation trend of the height of the pin 611 for identification, so that further detection and judgment are achieved.

As shown in fig. 5: the pins 611 are not parallel or the distances between the pins 611 are not consistent when viewed from the side, and if the lengths of the non-pins 611 are different due to design factors, the laser camera module 40 can be used for photographing and identifying so as to realize further detection and judgment.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A defect detection apparatus, comprising:

the detection light source module comprises one or more light source components, and the light source components are used for irradiating from the front surface and/or the back surface of the workpiece (61) to be detected;

the imaging module (70) is used for shooting from the front surface and/or the back surface of the workpiece (61) to be detected to form a first detection image;

the laser camera modules (40) are arranged around the workpiece (61) to be detected in a surrounding mode, and are used for emitting detection laser to the side face of the workpiece (61) to be detected and shooting to form a second detection image.

2. The defect detection apparatus of claim 1,

the laser camera module (40) comprises:

the mounting bracket (41), the mounting bracket (41) is used for fixing the laser camera module (40) at a position to be mounted;

the laser camera (42) is movably arranged on the mounting bracket (41), and the laser camera (42) can be driven to lift and/or rotate relative to the mounting bracket (41).

3. The defect detection apparatus of claim 2,

the detection light source module comprises a light source shell, the light source shell is provided with a light-transmitting channel aligned to the imaging module (70), and the imaging module (70) shoots the front surface of the workpiece (61) to be detected through the light-transmitting channel;

a first light source assembly (10) is arranged in the light source shell, and the first light source assembly (10) comprises a first lamp panel (13) used for emitting first detection light;

a beam splitter (132) and a first diffusion plate (131) are arranged along the light path of the first detection light, and the beam splitter (132) is positioned on the light path of the first detection light and the light transmission channel; after being reflected by the spectroscope (132), part of the first detection light is vertically irradiated on the front surface of the detected workpiece (61).

4. The defect detection apparatus of claim 3,

the light source housing comprises a first housing (11), the first light source assembly (10) being located within the first housing (11);

a shooting window (12) is formed in the first shell (11), the shooting window (12) is communicated with the light transmitting channel, and a lens (121) is arranged in the shooting window (12).

5. The defect detection apparatus of claim 4,

be equipped with heat radiation structure on first shell (11), heat radiation structure is close to in first lamp plate (13) setting.

6. The defect detection apparatus of claim 4,

a second light source component (20) is also arranged in the light source shell;

the second light source assembly (20) comprises a second lamp panel (22) used for emitting second detection light, the second lamp panel (22) is annular, and the second lamp panel (22) is arranged around the periphery of the light transmission channel;

and a second diffusion plate (221) is arranged along the light path of the second detection light, the second diffusion plate (221) is inclined to the first detection light, the second diffusion plate (221) is a diffusion plate, and the second detection light passes through the second diffusion plate (221) to form shadowless light which is obliquely irradiated on the front surface of the detected workpiece (61).

7. The defect detection apparatus of claim 6,

the light source shell also comprises a second shell (21), the second shell (21) is arranged on the first shell (11) and is positioned on one side, close to the workpiece (61) to be measured, of the first shell (11), and the mounting bracket (41) is fixed on the second shell (21);

the position, which is overlapped with the light-transmitting channel, on the second shell (21) is a light-transmitting structure.

8. The defect detection apparatus of claim 6,

the detection light source further comprises a third light source assembly (30);

third light source subassembly (30) include third shell (31), are equipped with third lamp plate (32) that are used for launching third detection light in third shell (31), follow the light path of third detection light is equipped with third diffuser plate (321), third detection light passes through behind third diffuser plate (321), shine perpendicularly in the reverse side of surveyed work piece (61).

9. The defect detection apparatus of claim 8,

first lamp plate (13), second lamp plate (22) and third lamp plate (32) include a plurality of lamp pearls respectively, the lamp pearl is the LED lamp pearl that the luminous chip of RGB three-colour mixes.

10. The defect detection apparatus of claim 8,

and the third diffusion plate (321) is provided with a longitudinal parallel film and a transverse parallel film.